Unless otherwise specifically provided in sections 50.1000 to 50.1300, the provisions of sections 50.1000 to 50.1200 in effect before January 1, 2000, shall apply to any county employee whose employment terminates before January 1, 2000. The provisions of sections 50.1000 to 50.1300, as amended, shall apply to any county employee whose employment terminates on or after January 1, 2000.